Uhlelo lokuhlola izinga lokushisa ezintweni zokushintsha ugesi luyisistimu ehlakaniphile esetshenziselwa ukuqapha izinga lokushisa ezindaweni ezibalulekile zezinto zokushintsha ugesi (njengama-circuit breaker, ama-disconnector, izixhumi zebhasi, iziphetho zamakhebula, njll.) ngesikhathi sangempela, ngenhloso yokuvimbela ukwehluleka kwezinto, umlilo, noma ukuphazamiseka kukagesi okubangelwa ukushisa ngokweqile.